NervousTissue - Nervous System Functions...

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    Nervous System Functions Communication/homeostasis Sensation Integration Reaction
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    Nervous System CNS  Brain Spinal Cord PNS Nerves Cranial nerves Spinal nerves Ganglia Sensory Autonomic 
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    Peripheral Nervous System Divisions Central nervous system Peripheral nervous system Brain Spinal cord Sympathetic division Parasympathetic division Visceral sensory division Somatic sensory division Visceral motor division Somatic motor division Sensory division Motor division
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    PNS Functional Divisions Viscerosensory “viscus” = organ sensation from internal organs (nausea, etc.) Somatosensory sensation from the skin Visceromotor motor to cardiac muscle, smooth muscle, glands  Somatomotor motor to skeletal muscle
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    Neuron Characteristics Each neuron is capable of performing the basic  functions of the nervous system. Sensation, Integration, Reaction Excitability Respond to stimuli (mechanical, chemical, electrical) Conductivity Quickly transmit electrical signals over long distances Secretion Releases a neurotransmitter to affect another cell
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    Functional Classes of Neurons 1 3 2 Central nervous system  Peripheral nervous system  Sensory/afferent  neurons  conduct signals from  receptors  to  the CNS Interneurons   (association neurons) are confined to the CNS Motor/efferent  neurons  conduct signals from the  CNS to effectors such as  muscles and glands Most cell  bodies are  in the CNS Two types  are in PNS: sensory autonomic  (visceromotor)
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    Typical Neuron Dendrites Soma Nucleus Nucleolus Axon Direction of  signal transmission Node of  Ranvier Internodes Synaptic  knobs Axon hillock Initial segment Myelin sheath Schwann cell Axon collateral Highly unusual cells  that can accomplish  unique functions.
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    Typical Neuron Cell body/Soma  is  the location of the  nucleus. Neurofibrils
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This note was uploaded on 03/30/2008 for the course ANATOMY 328 taught by Professor Krabbenhoft during the Spring '08 term at Wisconsin.

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NervousTissue - Nervous System Functions...

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